Minor (6)
'minor' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for lesser that I've seen before include "Smaller, minor" , "That which is smaller, as of two evils" , "Smaller in size or amount or value" , "Smaller; inferior" , "Not so important (one)" .)
'minor' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for small-time that I've seen before include "Of minor importance" , "Petty (criminal, usually)" , "Insignificant" .)
(Other definitions for ursa that I've seen before include "and 18 Down: The Great Bear" , "Bear (constellation)" , "The Major one is the Plough" , "- Major, - Minor, prominent constellations" , "'Major and Minor, constellations (4)'" .)